At the Manufacturing Floor: How are Glass Bottles Made?



Ever wondered how glass is made?
While you may have noticed the glass-blowing or blow-molding often used by artist or manufacturers of custom glass designs, they are hardly used by large-scale manufactures.
The IS methods have replaced all other methods of glass manufacturing worldwide. It is not clear where the name IS comes from. It could be the acronym of the creators, Ingle and Smith, or they could just be the short form for ‘Individual Section’.
The two maim popular methods in the IS methods are:
· The Press and Blow Method
· The Blow and Blow Method

Molten Glass

Before looking at the two different processes, we need to look how glass is actually formed. Before the actual process is begun, glass is first converted into molten glass or plastic glass so that it can be shaped.
Usually 90% of the glass stock is soda-lime glass. It consists of silica, calcium oxide, lime and small amounts of aluminum oxide, barium oxide, magnesia, ferric oxide and sulfur trioxide. Before this stock is melted, recycled glass is also added to the composition, which is in the shape of powdered glass.
The entire stock is then put into a furnace. The temperature of the furnace can go as high as 1670 degrees Fahrenheit. Once the stock is heated up and converted molten glass, one of the two methods are used.

Press and Blow Method

For this method, an IS machine is used which can have between 5 and 20 individual sections which work simultaneously to form glass containers.
When the temperature of the glass is higher than 1000 degrees, it reaches its plastic stage. Shearing blades are then used to cut the glass into molten gobs. These gobs are then delivered to the molds, where a metal plunger presses the gobs into the mold. This is where the gobs start taking shape and are termed as parison. The parison are then delivered to a final mold where they are blown to their final shape.
This process is mainly used producing wide-mouthed containers, such as mason jars, but can also be used for producing other types of containers.

Blow and Blow

The blow and blow method also takes place in the IS machine. The molten gob is delivered onto the mold, but instead of pressing, pressurized air is used to force the gob into the mold. When the gob becomes a parison, it is moved to the final mold and blown into shape. With this method, glass containers of any thickness level can be formed.

About the Company

PremiumVials is an online store and a global supplier of glass packaging products. Customers can order all types of ultraviolet glass bottles, containers, Blue Boston round bottles, jars and many more through their website or placing a phone call on 888 545-3117. 

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